A Scrum Master is a key role in the Scrum framework, responsible for facilitating the Scrum process and ensuring that the team adheres to Agile principles. They serve as a coach and mentor to the Scrum team, helping to remove obstacles that impede progress and fostering a collaborative environment. The Scrum Master also works closely with the Product Owner to ensure that the team's goals are aligned with the project's vision. By promoting best practices, facilitating ceremonies like daily stand-ups, sprint planning, and retrospectives, and protecting the team from external distractions, the Scrum Master plays a crucial role in driving the team's productivity and continuous improvement.